Malicious PDF — malware analysis report

Static analysis result for SHA-256 832d00568cb1099f…

MALICIOUS

PDF

100.9 KB Created: 2021-09-03 07:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 22d8eb3ef85a741298e632b958a006aa SHA-1: b257f1185d805871b35ee273ea07098e1312d688 SHA-256: 832d00568cb1099fa6cfbe7ae9ba445c0be62a24a346835b68bd5b204bed14b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting it is used as a lure for phishing or to distribute further malware. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wastran.ru/uplcv?utm_term=introduction+to+financial+econometrics+pdf PDF link annotation
    • http://fobas.cz/userfiles/file/88560625369.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/45f268ffd9dcf55192c27a585f5cf411/nafogusogu.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/nukepozugakejipuviligulib.pdfIn PDF document text
    • https://goodline.by/userfiles/file/rewoxez.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/31985538728.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/087e584d0deeb696d33b8b5e4dabaa44/45927945187.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/f854c7fc31e2a2a8950bfcc71f4f7091/42401314977.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/35358389315.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/xivimado.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0140eec77---venonivu.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/27534880861.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/mpd4jdqhjiqu2odhd18hc5m5pl/18738759332.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/wenit.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161189fd111daa---33699883112.pdfIn PDF document text
    • https://ekransamara.ru/files/fosefex.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/tawubujeniwotavidanokog.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ab7464e3344d3cc7a06c723a9396bc6b/19421489618.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126336583b4b---49017834404.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5e5f7f67e---kozob.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/mitibipozeronab.pdfIn PDF document text
    • https://maturana.cl/upload/file/91727060214.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/54175416464.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12147 10832 bytes
SHA-256: c94c9aa008b4fffb1f21fcdc98ae5373ded54103d8f152559c28694439aa421c
font_01_sfnt_off00013a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15256 19512 bytes
SHA-256: 4f5fd0624f36a686ec68fe1222144861c0342e8f8af0849ae9a694d4528f2f10

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